Joist



Jan. 12, 1943. R F, HERR 2,308,080

JOIST Filed Jan. '7, 1941 Pm/mep Heee INVENTOR www@ ATTORNEY PatentedJan. 12, 1943 UNITED STATE ,ransom s` PATENTI OFFICE Jors'r Richard r.nerr, warren, ohio Application January 7, 1941, serial No. 313,441

(ci. 18s- 31) Claims.

i This invention relates to a. unit of building construction and moreparticularly a jolst.

`'llhe principal object of the invention is to provide a joist formedofmetal and particularly of sheet or Strip metal.

A further object of the invention is to provide a joist formed of stripmetal and of lighter Weight than metal joists heretofore known to` theVart.

A still further object of the invention is the provision of. a. joistformed of strip metal` and having the appearance of a heavy, strong, andsturdy unit as compared with various otherV metal `joints known to theart.

A still further object of the invention is the provision of a Joistformed of strip metal the construction of the web portion of whichfollows accurately the lines of stress of the ,joist rather than onlyapproximately so, as common to metal joists heretoforeknown to the art.l

.The joist shown and described herein in accordance withthe inventioncomprises a construction of longitudinally extending spaced metalmembers preferably of channel cross section connected together at theirends` to form an anchorage and transversely connected therebetween by aweb member so as to form a Warren truss, and assembled from suitablyshaped metal i strip into an integrally continuous member. 'I'hetransversely connecting web member being formed lof V shaped stripmaterial bent at a sharp angle and welded at the points of contact withthe longitudinally extending chord members.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed without departing from the spirit of theinvention.

The invention is illustrated in the accompanying drawing, wherein: I

Figure Vl is a side elevation ofthe joist.

Figure 2 is a side elevation on an enlarged scale ofseveral componentparts of the joist showing the parts as. fabricated and before assemblyof the same.

Figure 3 is a side elevation showing the same parts in assembledrelation.

Figure 4 is a sectional I--I of Figure 2.

" Figure 5 is a cross sectional lines 5-5 of Figure 2.

By referring to the elevation taken on lines elevation taken on drawingand Figures l, 2,

and 3 in particular' it will be seen that the joist comprises a pair of:longitudinally extending spaced metal chord members preferably ofchannel crossA sectionV I0 and Il respectively, the chord llbeing formedof upturned end sections I2` Awhich terminateadjacentto and beneath theend sections of the chord l0 and are adapted to be aiilxed thereto bymeans of connector sections I3 positioned within` the opposed channelsl0 The chords i0 and ,Il comprisingichan-A nel shapes `preferably inopposed relation, are transversely connected throughout their parallellength by means of a web member Il made of strip material of an angleshape in transverse cross section, the apex` of the angle lying in acentral vertical plane, and being bent in a sharp,

angle l5 at eachv point of contactwith the chanll'is afllxed to thechords I0 and Il by a welding operation. i When the welding operationhas taken place the joist resulting is in the form' illustrated inFigure 3 of the drawing. V'I'he 'transversely positioned connecting webmember Il becomes a structural part of the joist, with thetransversely'connecting members I4 accurately following the lines ofstress of the structural assembly. This is made possible by theformation of the transversely connecting web member Il from stripmaterial which, due to its thinness, can be bent in a sharp anglewithout cutting any material as indicated by the numeral I5 much betterthan a round or thicker shape of,I

metal and therefore permits the web member so formed to follow theactual lines of stress. It will thus be seen that a Joist may be formedof strip material which material is advantageously carried in stockA incoils, a wide strip of which may'be readily slit to proper size andsubsequently forrned in the channel shapes or V shapes necessary thusmaking readily available a material supply for various sizes of joistsas it has been determined that two widths of strip of varying gauges aresatisfactory for the formation of the various sizes of joists commonlyin demand. The formation of this joist from strip material thus makesunnecessary the stockingof adequate supplies of bars from which otherioists known to the art are formed with'a result in savings in materialstorage as well as the simplified formation of theV shapes essential. Itwill thus be observed that a Joist has been provided which may beconveniently and economically-formed of strip stock through thefabrication of the strip material into two simple forms; the channel' orother desirable form used in the chords, and an angle shaped form bentin a sharp angle at points of contact with the longitudinal members toform the transversely connecting web member. It is apparent that thejoists may be constructed in various sizes from strip material ofstandard form which is readily available as the various sections haveonly to be formed and cut to the length desired and fabricated into thejoists. Details of the projection welding methods preferably utilized inthe formation of this joist have purposely been omitted as thel same arebelieved to be Well known in the art, however it may be pointed out thatother means of fastening the various portions of the joist togetherl maybe utilized such as spot welding, riveting, and the like. It willbe'observed that the joist formed according tothe disclosure herein madewill be considerably stronger per pound of weight than vthe joistscommonly known to the art formed of bar or shaped material. What I claimis:

1. In a joist the combination of spaced chords of suitable cross sectionand an interconnecting web formed "of strip stock, the web beingbf ananglel shape in transverse cross section, the apex of the angle lying ina central vertical plane, the "web being vformed into diagonallypositioned elements by being bent sharply without cutting any materialso that substantially single .line contacts areorrned with the surfacesof the said chords, tlfe said web being aiiixed to the said chords onthe line oi contact'.

2. In a.' joist the combination of longitudinally extending chordsformed of strip stock of desirable cross sectional shape and aninterconnecting web formed of strip stock, the web being of an angleshape in transverse cross section, the apex of the angle lying in acentral vertical plane, the web being formed into `diagonally positionedelements by being bent sharply without cutting any material so thatAsubstantially single line contactsare formed with the surfaces of thesaid chords, the said web being afixed to the said chords on the line ofcontact.

3. A joist comprising longitudinally extending chords having a singletransversely interconnecting web member formed of strip stock intodiagonally positioned elements by being bent sharply without cutting anymaterial so as to form single line contacts with the 'surfaces of thechords, the web member being of an angle shape in transverse crosssection, the apex of the angle lying in a central vertical plane, theweb member Welded to the chords on the line of contact therewith so asto form a joist wherein the web members follow the lines of stress ofthe joist.

4. A joist comprising upper and lower chords..v

of suitable cross section having a web member formed into diagonallypositioned elements spacing the said chords apart, the said web formedof strip and being of an angle shape in transvers'cross'section, theapex of the angle lying Lin a .central'vertical plane, the said webbeing bent sharply at its points of contact with the surfaces of thesaid upper and lower chords sol as to form substantially single linecontacts therewith and to permit the diagonally positioned veb elementsto follow the lines of stress of the oist.

5. A joist comprising uppertand lower chords formed of strip stockmaterial4 of desirable cross section having a web /member formed intodiagonally positioned Vielements spacing the said chords apart, the saidweb formed of strip stock and being of an angle shape in transversecross section, the apex of the angle lying in a central vertical plane,the said web being bent sharply atits points of contact withthe surfacesof the said upper and lower chords so as tor form substantially singleline contacts therewith and to permit the diagonally positioned webelements to follow the linesof stress of the joist, the web autogenouslywelded to the chords on the/line of contact'therewith.-

RICHARD ruina.

